Yaesu G-800S Repair
The Broken POT is repaired and G-800S is brought back to life
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Article Summary
I had a G800-S rotator unused for nearly 5 years. When it was put on service, due to my mistake, I installed it upside-down. Then the water got filled up inside and made the rotator indication somewhat unstable. The indicator moves about 30 deg up and down sometimes by it’s own. This became a problem for me to use it effectively and I decided to open it.
Article Highlights
- Rotor Potentiometer Repair
- Loosing Some Angles
- Gaining the functionality back
Kamal Edirisinghe
4S7AB / KA5MAL
Author Sep 2020
Having More than 35 years of experience in the Field of Amateur Radio, I have published many articles in prestigious international publications like, QST, CQ-DL, NCJ, Six-News etc.. Here in this web site, these write-ups are intended to give you knowledge about my designs and projects related to the hobby. The articles about foreign HAM activities are intended to share my experience.
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The rotor was opened carefully not to drop the bearings all over the place. The potentiometer is a 500Ohm wire wound type..
The fix was simple and straightforward. I have soldered a 120Ohm resistor to the point where the wire was broken. Then the rotator lost some degree of indication (in my case it lost the overlapping rotation only). So I have 360 degree or slightly more of indication with my rotor which is 100% good enough.
Everything was installed as per the manual (don’t forget to grease the bearings since you opened it). Now it works well.
After opening the backside metalic cap, I found that the higher resistance end side wire was disconnected at about 400Ohm. That was causing all the problems I described above.